OK, thanks a lot for the information.
Best regards,
Julien
On 05/24/2013 03:48 PM, Frank Warmerdam wrote:
Julien,
I am not aware of any existing way to do this. I might be nice if an
OGR VRT could apply something like this on the fly, but that doesn't
exist currently.
Best regards,
Frank
On Fri, May 24, 2013 at 3:04 AM, Julien Malik <julien.ma...@c-s.fr
<mailto:julien.ma...@c-s.fr>> wrote:
Hello,
Is it possible to apply an on-the-fly affine transform to an OGR
dataset with the help of VRT ?
Could not find any help or mailing list message about this...
The source of the issue is we want to display in QGIS a
non-georeferenced raster with an associated GML mask, where the
coordinates in the mask are in pixel indices, relative to the
raster (X and Y coordinates are unsigned integers).
When loading those two layers as-is in QGis, the raster is
correctly displayed (north up, south down) but the GML mask is
inverted, with a symmetry around the Y axis (Y coordinates
interpreted as south->north when Y increases). We would like the
GML mask to be overlayed on the raster, so applying "f(Y)=-Y" on
the coordinates would do the trick.
Any other idea to cope with this issue would be appreciated. We
asked on qgis-users and still no luck.
Thanks in advance,
Julien
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